Recommended Periodic Inspection - YASKAWA U1000 Technical Manual

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Recommended Periodic Inspection

Table 7.2 outlines the recommended periodic inspections for Yaskawa drive installations. Although periodic inspections should
generally be performed once a year; the drive may require more frequent inspection in harsh environments or with rigorous
use. Operating and environmental conditions, along with experience in each application, will determine the actual inspection
frequency for each installation. Periodic inspection will help to avoid premature deterioration in performance or product failure.
Copy this checklist and mark the "Checked" column after each inspection.
n Periodic Inspection
WARNING! Electrical Shock Hazard. Do not inspect, connect, or disconnect any wiring while the power is on. Failure to comply can result
in serious personal injury. Before servicing, disconnect all power to the equipment. The capacitor for the control power supply remains
charged even after the power supply is turned off. The charge indicator LED will extinguish when the control power supply voltage is below
50 Vdc. To prevent electric shock, wait for at least the time specified on the warning label; after all indicators are OFF, measure for unsafe
voltages to confirm the drive is safe prior to servicing.
Inspection Area
• Inspect equipment for discoloration from overheating
or deterioration.
• Inspect for damaged or deformed parts.
General
Inspect for dirt, foreign particles, or dust collection on
components.
• Inspect wiring and connections for discoloration,
Conductors and
damage, or heat stress.
Wiring
• Inspect wire insulation and shielding for wear.
Inspect terminals for stripped, damaged, or loose
Terminals
connections.
• Inspect contactors and relays for excessive noise
during operation.
Relays and Contactors
• Inspect coils for signs of overheating such as melted
or cracked insulation.
• Inspect for leaking, discoloration, or cracks.
Electrolytic Capacitor
• Check if the cap has come off, for any swelling, or if
the sides have burst open.
Diode, IGBT Inspect for dust or other foreign material collected on the
(Power Transistor) surface.
Operation Check Check for increased vibration or abnormal noise.
• Inspect terminals for stripped, damaged, or loose
connections.
General
• Make sure all terminals have been properly tightened.
Check for any odor, discoloration, and rust. Make sure
Circuit Boards connections are properly fastened and that no dust or oil
mist has accumulated on the surface of the board.
• Check for abnormal oscillation or unusual noise.
Cooling Fan,
Circulation Fan
• Check for damaged or missing fan blades.
Inspect for dust or other foreign material collected on the
Heatsink
surface.
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Table 7.2 Periodic Inspection Checklist
Inspection Points
Main Circuit Periodic Inspection
Motor Periodic Inspection
Control Circuit Periodic Inspection
Cooling System Periodic Inspection
Corrective Action
• Replace damaged components as required.
• The drive has few serviceable parts and may require
complete drive replacement.
• Inspect enclosure door seal if used.
• Remove foreign particles and dust with a vacuum
cleaner to avoid touching parts.
• Replace components if cleaning is not possible.
Repair or replace damaged wiring.
Tighten loose screws and replace damaged screws or
terminals.
• Check coil voltage for overvoltage or undervoltage
conditions.
• Replace damaged removable relays, contactors, or
circuit board.
The drive has few serviceable parts and may require
complete drive replacement.
Remove foreign particles and dust with a vacuum
cleaner to avoid touching parts.
Stop the motor and contact qualified maintenance
personnel as required.
• Tighten loose screws and replace damaged screws
or terminals.
• If terminals are integral to a circuit board, then
board or drive replacement may be required.
• Fix any loose connections.
• If an antistatic cloth or vacuum plunger cannot be
used, replace the board.
• Do not use any solvents to clean the board.
• Remove foreign particles and dust with a vacuum
cleaner to avoid touching parts.
The drive has few serviceable parts and may require
complete drive replacement.
• Replace as required.
• Refer to Drive Cooling Fans on page 423
information on cleaning or replacing the fan.
Remove foreign particles and dust with a vacuum
cleaner to avoid touching parts.
7.2 Inspection
Checked
7
for
419